Methylene blue

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Methylene blue
Methylene blue-2d-skeletal.svg
Clinical data
Trade names Urelene blue, Provayblue, Proveblue, other[2][3]
AHFS/Drugs.com Monograph
Pregnancy
category
Routes of
administration		 by mouth, IV
ATC code none
Legal status
Legal status
Identifiers
Synonyms CI 52015
CAS Number 61-73-4 YesY
PubChem (CID) 6099
ChemSpider 5874 YesY
ChEBI CHEBI:6872 YesY
ChEMBL CHEMBL405110 YesY
ECHA InfoCard 100.000.469
Chemical and physical data
Formula C16H18ClN3S
Molar mass 319.85 g/mol
3D model (Jmol) Interactive image
  (verify)

Methylene blue, also known as methylthioninium chloride, is a medication and dye.[1] As a medication it is mainly used to treat methemoglobinemia.[1][3] Specifically it is used to treat methemoglobinemia levels that are greater than 30% or in which there are symptoms despite oxygen therapy.[3] It has previously been used for cyanide poisoning and urinary tract infections but this use is no longer recommended. It is typically given by injection into a vein.[1]

Common side effects include headache, vomiting, confusion, shortness of breath, and high blood pressure. Other side effects include serotonin syndrome, red blood cell breakdown, and allergic reactions.[1] Use often turns the urine, sweat, and stool blue to green in color.[3] While use during pregnancy may harm the baby, not using in methemoglobinemia is likely more dangerous.[1][3] Methylene blue is a thiazine dye.[1] It works by converting the ferric iron in hemoglobin to ferrous iron.[3]

Methylene blue was first prepared in 1876 by Heinrich Caro.[4] It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.[5] In the United States a 50 mg vial costs about 191.40 USD.[6] In the United Kingdom a 50 mg vial costs the NHS about 39.38 pounds.[3]

Medical uses[edit]

Methemoglobinemia[edit]

While many texts indicate that methylene blue has oxidizing agent properties, its effects as an oxidizing agent occur only at very high doses.[citation needed] At pharmacologic doses it has reducing agent properties. It is owing to this reason that methylene blue is employed as a medication for the treatment of methemoglobinemia. This can arise from ingestion of certain pharmaceuticals, toxins, or broad beans.[7] Normally, through the NADH or NADPH dependent methemoglobin reductase enzymes, methemoglobin is reduced back to hemoglobin. When large amounts of methemoglobin occur secondary to toxins, methemoglobin reductases are overwhelmed. Methylene blue, when injected intravenously as an antidote, is itself first reduced to leucomethylene blue, which then reduces the heme group from methemoglobin to hemoglobin. Methylene blue can reduce the half life of methemoglobin from hours to minutes.[8] At high doses, however, methylene blue actually induces methemoglobinemia, reversing this pathway.[8]

Combined with light[edit]

Methylene blue combined with light has been used to treat resistant plaque psoriasis,[9]

Urinary tract infection[edit]

Methylene blue is a component of a frequently prescribed urinary analgesic/anti-infective/anti-spasmodic known as "Prosed", a combination of drugs which also contains phenyl salicylate, benzoic acid, hyoscyamine sulfate, and methenamine (aka hexamethylenetetramine and not to be confused with 'methanamine').[10]

Cyanide poisoning[edit]

Since its reduction potential is similar to that of oxygen and can be reduced by components of the electron transport chain, large doses of methylene blue are sometimes used as an antidote to potassium cyanide poisoning, a method first successfully tested in 1933 by Dr. Matilda Moldenhauer Brooks in San Francisco,[11] although first demonstrated by Bo Sahlin of Lund University, in 1926.[11][12]

Dye or stain[edit]

Methylene blue is used in endoscopic polypectomy as an adjunct to saline or epinephrine, and is used for injection into the submucosa around the polyp to be removed. This allows the submucosal tissue plane to be identified after the polyp is removed, which is useful in determining if more tissue needs to be removed, or if there has been a high risk for perforation. Methylene blue is also used as a dye in chromoendoscopy, and is sprayed onto the mucosa of the gastrointestinal tract in order to identify dysplasia, or pre-cancerous lesions. Intravenously injected methylene blue is readily released into the urine and thus can be used to test the urinary tract for leaks or fistulas.

In surgeries such as sentinel lymph node dissections, methylene blue can be used to visually trace the lymphatic drainage of pertinent tissues. Similarly, methylene blue is added to bone cement in orthopedic operations to provide easy discrimination between native bone and cement. Additionally, methylene blue accelerates the hardening of bone cement, increasing the speed at which bone cement can be effectively applied. Methylene blue is used as an aid to visualisation/orientation in a number of medical devices, including a Surgical sealant film, TissuePatch.

When methylene blue is "polychromed" (oxidized in solution or "ripened" by fungal metabolism,[13] as originally noted in the thesis of Dr D L Romanowsky in 1890s), it gets serially demethylated and forms all the tri, di, mono and non methyl intermediates - which are Azure B, Azure A, Azure C and thionine respectively.[14] This is the basis of the basophilic part of the spectrum of Romanowski-Giemsa effect. If only synthetic Azure B and Eosin Y is used, it may serve as a standardized Giemsa stain; but, without methylene blue, the normal neutrophilic granules tend to overstain and look like toxic granules. On the other hand, if methylene blue is used it might help to give the normal look of neutrophil granules and may additionally also enhances the staining of nucleoli and polychromatophilic RBCs (reticulocytes).[15]

A traditional application of methylene blue is the intravital or supravital staining of nerve fibers, an effect first described by Paul Ehrlich in 1887.[16] A dilute solution of the dye is either injected into tissue or applied to small freshly removed pieces. The selective blue coloration develops with exposure to air (oxygen) and can be fixed by immersion of the stained specimen in an aqueous solution of ammonium molybdate. Vital methylene blue was formerly much used for examining the innervation of muscle, skin and internal organs.[17][18][19] The mechanism of selective dye uptake is incompletely understood; vital staining of nerve fibers in skin is prevented by ouabain, a drug that inhibits the Na/K-ATPase of cell membranes.[20]

Placebo[edit]

Methylene blue has been used as a placebo; physicians would tell their patients to expect their urine to change color and view this as a sign that their condition had improved.[21] This same side effect makes methylene blue difficult to test in traditional placebo-controlled clinical studies.[22]

Ifosfamide toxicity[edit]

Another use of methylene blue is to treat ifosfamide neurotoxicity. Methylene blue was first reported for treatment and prophylaxis of ifosfamide neuropsychiatric toxicity in 1994. A toxic metabolite of ifosfamide, chloroacetaldehyde (CAA), disrupts the mitochondrial respiratory chain, leading to an accumulation of nicotinamide adenine dinucleotide hydrogen (NADH). Methylene blue acts as an alternative electron acceptor, and reverses the NADH inhibition of hepatic gluconeogenesis while also inhibiting the transformation of chloroethylamine into chloroacetaldehyde, and inhibits multiple amine oxidase activities, preventing the formation of CAA.[23] The dosing of methylene blue for treatment of ifosfamide neurotoxicity varies, depending upon its use simultaneously as an adjuvant in ifosfamide infusion, versus its use to reverse psychiatric symptoms that manifest after completion of an ifosfamide infusion. Reports suggest that methylene blue up to six doses a day have resulted in improvement of symptoms within 10 minutes to several days.[24] Alternatively, it has been suggested that intravenous methylene blue every six hours for prophylaxis during ifosfamide treatment in patients with history of ifosfamide neuropsychiatric toxicity.[25] Prophylactic administration of methylene blue the day before initiation of ifosfamide, and three times daily during ifosfamide chemotherapy has been recommended to lower the occurrence of ifosfamide neurotoxicity.[26]

Vasoplegic syndrome[edit]

Some literature has reported the use of methylene blue as an adjunct in the management of people experiencing vasoplegic syndrome after cardiac surgery.[27][28][29]

Side effects[edit]

Cardiovascular Central Nervous System Dermatologic Gastrointestinal Genito-urinary Hematologic
• Hypertension
• Precordial pain		 • Dizziness
• Mental confusion
• Headache
• Fever		 • Staining of skin
• Injection site necrosis (SC)		 • Fecal discoloration
• Nausea
• Vomiting
• Abdominal pain		 • Discoloration of urine (doses over 80 µg)
• Bladder irritation		 • Anemia

[30][31]

Methylene blue is a monoamine oxidase inhibitor (MAOI),[32] and if infused intravenously at doses exceeding 5 mg/kg, may precipitate serious serotonin toxicity, serotonin syndrome, if combined with any selective serotonin reuptake inhibitors (SSRIs) or other serotonin reuptake inhibitor (e.g., duloxetine, sibutramine, venlafaxine, clomipramine, imipramine).[33]

It causes hemolytic anemia in carriers of the G6PD (favism) enzymatic deficiency.

Chemistry[edit]

Methylene blue should not be confused with methyl blue, another histology stain, new methylene blue, nor with the methyl violets often used as pH indicators. Methylene blue is a heterocyclic aromatic chemical compound (a phenothiazine derivative) with the chemical formula C16H18N3SCl. At room temperature it appears as a solid, odorless, dark green powder that yields a blue solution when dissolved in water. The hydrated form has 3 molecules of water per unit of methylene blue. Methylene blue has a pH of 3 in water(10g/l) at 25 °C (77 °F).

Preparation[edit]

This compound may be prepared by treating dimethyl-4-phenylenediamine with hydrogen sulfide dissolved in hydrochloric acid, followed by oxidation with ferric chloride:[34]

Preparation of methylene blue.png

Light absorption properties[edit]

Absorption spectrum of methylene blue, in terms of the molar extinction coefficient (base 10 logarithm). In this dataset a peak absorbance of 1.7 (i.e. 98% of transmitted light absorbed) was observed with 665 nm light passing through 1 cm of 10 micromolar methylene blue solution.

Methylene blue is a potent cationic dye with maximum absorption of light around 670 nm. The specifics of absorption depend on a number of factors, including protonation, adsorption to other materials, and metachromasy - the formation of dimers and higher-order aggregates depending on concentration and other interactions:[35]

Species Absorption peak Extinction coefficient (dm3/mole·cm)
MB+ (solution) 664 95000
MBH2+ (solution) 741 76000
(MB+)2 (solution) 605 132000
(MB+)3 (solution) 580 110000
MB+ (adsorbed on clay) 673 116000
MBH2+ (adsorbed on clay) 763 86000
(MB+)2 (adsorbed on clay) 596 80000
(MB+)3 (adsorbed on clay) 570 114000

Other uses[edit]

A volumetric flask of a methylene blue solution

Redox indicator[edit]

Methylene blue is widely used as a redox indicator in analytical chemistry. Solutions of this substance are blue when in an oxidizing environment, but will turn colorless if exposed to a reducing agent. The redox properties can be seen in a classical demonstration of chemical kinetics in general chemistry, the "blue bottle" experiment. Typically, a solution is made of glucose (dextrose), methylene blue, and sodium hydroxide. Upon shaking the bottle, oxygen oxidizes methylene blue, and the solution turns blue. The dextrose will gradually reduce the methylene blue to its colorless, reduced form. Hence, when the dissolved dextrose is entirely consumed, the solution will turn blue again.

Peroxide generator[edit]

Methylene blue is also a photosensitizer used to create singlet oxygen when exposed to both oxygen and light. It is used in this regard to make organic peroxides by a Diels-Alder reaction which is spin forbidden with normal atmospheric triplet oxygen.

Sulfide analysis[edit]

The formation of methylene blue after the reaction of hydrogen sulfide with dimethyl-p-phenylenediamine and iron(III) at pH 0.4 – 0.7 is used to determine by photometric measurements sulfide concentration in the range 0.020 to 1.50 mg/L (20 ppb to 1.5 ppm). The test is very sensitive and the blue coloration developing upon contact of the reagents with dissolved H2S is stable for 60 min. Ready-to-use kits such as the Spectroquant sulfide test[36] facilitate routine analyses. The methylene blue sulfide test is a convenient method often used in soil microbiology to quickly detect in water the metabolic activity of sulfate reducing bacteria (SRB). It should be observed that in this test, methylene blue is a product of reaction and not a reagent.

The addition of a strong reducing agent, such as ascorbic acid, to a sulfide-containing solution is sometimes used to prevent sulfide oxidation from atmospheric oxygen. Although it is certainly a sound precaution for the determination of sulfide with an ion selective electrode, it might however hamper the development of the blue color if the freshly formed methylene blue is also reduced, as described here above in the paragraph on redox indicator.

Water testing[edit]

Further information: MBAS assay

A color reaction in an acidified, aqueous methylene blue solution containing chloroform can detect anionic surfactants in a water sample. Such a test is known as an MBAS assay (methylene blue active substances assay).

The MBAS assay cannot distinguish between specific surfactants, however. Some examples of anionic surfactants are carboxylates, phosphates, sulfates, and sulfonates.

Methylene blue value of fine aggregate[edit]

Methylene blue value reflects the amount of clay minerals in aggregate samples.[37] Methylene blue solution is successively added to fine aggregate which is being agitating in water. The presence of free dye solution can be checked with stain test on a filter paper.[38]

Biological staining etc[edit]

In biology methylene blue is used as a dye for a number of different staining procedures, such as Wright's stain and Jenner's stain. Since it is a temporary staining technique, methylene blue can also be used to examine RNA or DNA under the microscope or in a gel: as an example, a solution of methylene blue can be used to stain RNA on hybridization membranes in northern blotting to verify the amount of nucleic acid present. While methylene blue is not as sensitive as ethidium bromide, it is less toxic and it does not intercalate in nucleic acid chains, thus avoiding interference with nucleic acid retention on hybridization membranes or with the hybridization process itself.

It can also be used as an indicator to determine whether eukaryotic cells such as yeast are alive or not. The methylene blue is reduced in viable cells leaving them unstained. However dead cells are unable to reduce the oxidized methylene blue and the cells are stained blue. Methylene blue can interfere with the respiration of the yeast as it picks up hydrogen ions made during the process.

Aquaculture[edit]

Methylene blue is used in aquaculture and by tropical fish hobbyists as a treatment for fungal infections. It can also be effective in treating fish infected with ich although a combination of malachite green and formaldehyde is far more effective against the parasitic protozoa Ichthyophthirius multifiliis. It is usually used to protect newly laid fish eggs from being infected by fungus or bacteria. This is useful when the hobbyist wants to artificially hatch the fish eggs. Methylene Blue is also very effective when used as part of a "medicated fish bath" for treatment of ammonia, nitrite, and cyanide poisoning as well as for topical and internal treatment of injured or sick fish as a "first response".[39]

History[edit]

Methylene blue has been described as "the first fully synthetic drug used in medicine." Methylene blue was first prepared in 1876 by German chemist Heinrich Caro.[40]

Its use in the treatment of malaria was pioneered by Paul Guttmann and Paul Ehrlich in 1891. During this period before the first World War, researchers like Ehrlich believed that drugs and dyes worked in the same way, by preferentially staining pathogens and possibly harming them. Methylene blue continued to be used in the second World War, where it was not well liked by soldiers, who observed, "Even at the loo, we see, we pee, navy blue." Antimalarial use of the drug has recently been revived.[41] It was discovered to be an antidote to carbon monoxide poisoning and cyanide poisoning in 1932 by Matilda Brooks.[42]

The blue urine was used to monitor psychiatric patients' compliance with medication regimes. This led to interest - from the 1890s to the present day - in the drug's antidepressant and other psychotropic effects. It became the lead compound in research leading to the discovery of chlorpromazine.[43]

Names[edit]

The International Nonproprietary Name (INN) of methylene blue is methylthioninium chloride.[44][45]

Research[edit]

Malaria[edit]

Methylene blue was identified by Paul Ehrlich about 1891 as a possible treatment for malaria.[46] It disappeared as an anti-malarial during the Pacific War in the tropics, since American and Allied soldiers disliked its two prominent, but reversible side effects: turning the urine blue or green, and the sclera (the whites of the eyes) blue. Interest in its use as an anti-malarial has recently been revived,[43] especially due to its low price. Several clinical trials are in progress, trying to find a suitable drug combination. According to studies on children in Africa, it appears to have efficacy against malaria, but the attempts to combine methylene blue with chloroquine were disappointing.[47]

Alzheimer's[edit]

Methylene blue has been investigated for treatment of Alzheimer's dementia.[48][49] Methylene blue is proposed to affect neurodegeneration in Alzheimer's disease via inhibition of tau protein aggregation. Methylene blue also affects dissociation of amyloids[50][51] TauRx Therapeutics have reformulated the drug, under the brand name LMTX. This formulation is undergoing phase 3 clinical trials for safety and efficacy as "TRx0237".[52] LMTX addresses some of the concerns about dose-response which were raised earlier in the study.[53]

Bipolar disorder[edit]

Methylene blue has been studied as an adjunctive medication in the treatment of bipolar disorder.[54]

Viruses[edit]

It has been studied in AIDS-related Kaposi's sarcoma,[55] West Nile virus,[56] and to inactivate staphylococcus aureus,[57] and HIV-1.[58] Phenothiazine dyes and light have been known to have virucidal properties for over 70 years.[59]

See also[edit]

References[edit]

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External links[edit]

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